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Patented Sept. 4, 1923.

UNITED ,STATES PATENT .OFFICE.

ALBERT GHEVALIER, OF PARIS,

FRANCE, ASSIGNOR TO SOCIETE DU PARIS, FRANCE.

FEUTRE, OF

METHOD FOR CARROTTING FUR AND HAIR.

invented new and useful Improvements in Methods for Carrotting Fur and Hair, of

- which the following is a specification.

The operation known as carrotting consists in dissolving or attacking by suitable means the cuticle of the hair to be used in the manufacture of felt in such manner as to release the end of the series of scales whose assemblage constitutes the surface of the hair.

My invention consists in an improved method for cal-rotting hair, for use in the manufacture of hats in which method/alkalimetal or alkaline earth sulphides are employed in pure water or in a slightly alkaline solution.

The alkali-metal and alkaline earth sul phides'have the property of dissolving the" roductions of the epidermis such as hair, eathers or horn with more or less efiicacy ac- 2 cording to the particular sulphide em 10 ed.

Concentrated solutions of these su phldes will entirely dissolve the hair, but their action may be regulated by suitably diluting the same whereby only the surface portion of the hair shallbe attacked and the sulphide shall be unable to continue its action by reason of the rapid upon contact with the airaj r 0 The advantages obtained by the use of sulphides for the carrotting operation are considerable.

The ripening process for the hair may be dispensed with. The hair which is prepared by my process is of such nature as to be felted immsjtliately after the carrotting is effected an 4 without being obliged to wait for several months for the ripening of the hair as in ,the known methods. The felt which is thus obtained will ossess all the necessary properties as regards tenacity and fineness of grain.

Tanningpf the skins after the\carrotting Application filed February 2, 1921. Serial No. 441,851.

pxidation thereof process is rendered possible. In the known methods it is impossible to make use of the skins after the removal of the hair except in the shape of raw material for glue manufacture. The skins are in fact attacked more or less by the acid liquids or va ors used,

and the high temperature of t e drying room causes the sk1n to lose its normal strength.

In the process according to my invention,

the skins are not attacked nor is a high temperature employed, and for this reason the skins may be treated by the current methods of hair removal in view of the subsequent tanning of the same.

By way of example, in accordance with my improved method, the skins are brushed over with a 4 per cent solution of monosulphide' of sodium in pure or slightly alkaline water. The skins are dried either in the open air or ina drying room provided with a considerable supply of air. They are ready for use immediately after the drying operation is completed.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A process for carrotting hair for use in the manufacture of hats, which process consists in subjecting animal skins to the action of a soluble metallic sulphide and allowing the skins to dry in the presence of air, thereby causing oxidation of the sulphide solu- ALBERT CIfI EVALIER.

signed my '80 tion and checking the destructive action of 

